Experimental study for extraction of normal modes

S. Y. Chen, Ming-Shaung Ju, Y. G. Tsuei

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

A frequency-domain technique to extract the normal mode from the measurement data for highly coupled structures is developed. The relation between the complex frequency response functions and the normal frequency response functions is derived. An algorithm is developed to calculate the normal modes from the complex frequency response functions. In this algorithm, only the magnitude and phase data at the undamped natural frequencies are utilized to extract the normal mode shapes. In addition, the developed technique is independent of the damping types. It is only dependent on the model of analysis. Two experimental examples are employed to illustrate the applicability of the technique. The effects due to different measurement locations are addressed. The results indicate that this technique can successfully extract the normal modes from the noisy frequency response functions of a highly coupled incomplete system.

Original languageEnglish
Title of host publication15th Biennial Conference on Mechanical Vibration and Noise
EditorsK.W. Wang, B. Yang, J.Q. Sun, K. Seto, K. Yoshida, al et al
Volume84
Edition3 Pt B/1
Publication statusPublished - 1995
EventProceedings of the 1995 ASME Design Engineering Technical Conference. Part C - Boston, MA, USA
Duration: 1995 Sep 171995 Sep 20

Other

OtherProceedings of the 1995 ASME Design Engineering Technical Conference. Part C
CityBoston, MA, USA
Period95-09-1795-09-20

Fingerprint

Frequency response
Natural frequencies
Damping

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Chen, S. Y., Ju, M-S., & Tsuei, Y. G. (1995). Experimental study for extraction of normal modes. In K. W. Wang, B. Yang, J. Q. Sun, K. Seto, K. Yoshida, & A. et al (Eds.), 15th Biennial Conference on Mechanical Vibration and Noise (3 Pt B/1 ed., Vol. 84)
Chen, S. Y. ; Ju, Ming-Shaung ; Tsuei, Y. G. / Experimental study for extraction of normal modes. 15th Biennial Conference on Mechanical Vibration and Noise. editor / K.W. Wang ; B. Yang ; J.Q. Sun ; K. Seto ; K. Yoshida ; al et al. Vol. 84 3 Pt B/1. ed. 1995.
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Chen, SY, Ju, M-S & Tsuei, YG 1995, Experimental study for extraction of normal modes. in KW Wang, B Yang, JQ Sun, K Seto, K Yoshida & A et al (eds), 15th Biennial Conference on Mechanical Vibration and Noise. 3 Pt B/1 edn, vol. 84, Proceedings of the 1995 ASME Design Engineering Technical Conference. Part C, Boston, MA, USA, 95-09-17.

Experimental study for extraction of normal modes. / Chen, S. Y.; Ju, Ming-Shaung; Tsuei, Y. G.

15th Biennial Conference on Mechanical Vibration and Noise. ed. / K.W. Wang; B. Yang; J.Q. Sun; K. Seto; K. Yoshida; al et al. Vol. 84 3 Pt B/1. ed. 1995.

Research output: Chapter in Book/Report/Conference proceedingChapter

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AB - A frequency-domain technique to extract the normal mode from the measurement data for highly coupled structures is developed. The relation between the complex frequency response functions and the normal frequency response functions is derived. An algorithm is developed to calculate the normal modes from the complex frequency response functions. In this algorithm, only the magnitude and phase data at the undamped natural frequencies are utilized to extract the normal mode shapes. In addition, the developed technique is independent of the damping types. It is only dependent on the model of analysis. Two experimental examples are employed to illustrate the applicability of the technique. The effects due to different measurement locations are addressed. The results indicate that this technique can successfully extract the normal modes from the noisy frequency response functions of a highly coupled incomplete system.

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Chen SY, Ju M-S, Tsuei YG. Experimental study for extraction of normal modes. In Wang KW, Yang B, Sun JQ, Seto K, Yoshida K, et al A, editors, 15th Biennial Conference on Mechanical Vibration and Noise. 3 Pt B/1 ed. Vol. 84. 1995